To: Gemologists & Jewelers.. Need appraisal on a 175 Carat Star Garnet from mine in Idaho..?

Question

Star Garnet is in the rough..

Answer 1

Here is a pricing guide from a web site that sells Idaho Star Garnets commercially. As you can see, you will not really know what you have until it is cut.

PRICING GUIDELINES
We use the following chart and then adjust up or down for the unique characteristics of each stone. Also consider that it takes about the same amount of time to cut a 2 carat stone as it does to cut a 25 carat. We may charge a higher price per ct. for a small stone and a lower price per ct. for a large one (to help make them more affordable).
The primary value of a star garnet is based on the star. We grade #1 through #8 and this table starts with that number. We then adjust the value up or down based on the other characteristics of the stone.

Sharp 6 ray -- base $30.00 per ct -- normal range $30.00 to $50.00 per ct.
Medium 6 ray -- base $20.00 per ct -- normal range $20.00 to $25.00 per ct.
Weak 6 ray -- base $15.00 per ct -- normal range $15.00 to $20.00 per ct.
Sharp 4 ray w/ 2 weaker rays -- base $15.00 per ct -- range $15.00 to $20.00 per ct.
Medium 4 ray w/ 2 weaker rays -- base $10.00 per ct -- range $10.00 to $15.00 per ct.
Sharp 4 ray -- base $10.00 per ct -- normal range $10.00 to $15.00 per ct.
Medium 4 ray -- base $8.00 per ct -- normal range $8.00 to $12.00 per ct.
Weak 4 ray -- base $5.00 per ct -- normal range $4.00 to $10.00 per ct.

Answer 2

It is totally impossible to make an appraisal on a stone without having it in your hand to examine. Your question contained no picture nor even the information as to if it is cut or rough. You must take the stone to a reliable jeweller of gem dealer and get a professional opinion - I know it will cost you something but the answer will have some value. Anything anyone tells you in answer to your question as it is written will be nothing but a wild guess.